Tiket kereta api

#include<stdio.h>
#include<conio.h>
#include<iostream>
#include<string.h>
using namespace std;
main()
{
char nk[23],np[23],kd[23],lagi,dcs[23];
int harga,kls,jml,pb,bt,dc,tp,ub,uk;

logo:
system("cls");
cout<<"\t\t\tPROGRAM TIKET KERETA\n";
cout<<"\==============================\n\n";
cout<<"masukan kode kereta[AG/AL/PH]:\t";
cin>>kd;
cout<<"\npilihan  kelas [1/2/3]:\n\n";
cout<<"1.Eksekutif\n";
cout<<"2.Bisnis\n";
cout<<"3.Ekonomi\n\n";
cout<<"masukan kelas [1/2/3]:\t";
cin>>kls;

atas:
system("cls");
cout<<"\t\t\tPROGRAM TIKET KERETA\n";
cout<<"\t\t==============================\n";
if (strcmp(kd,"AG")==0||strcmp(kd,"ag")==0)
{
strcpy(nk,"Arga kembar");
if(kls==1)

harga=32000;

else if(kls==2)
harga=8000;

else if(kls==3)
harga=4000;

else if(kls>3)
cout<<"\n\nMAAF KODE YANG ANDA MASUKAN SALAH"<<endl<<endl;
cout<<"\n\n\n\n\n\t\t\t\t\tinput ulang [Y/T]?:";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto logo;
else
goto bawah;
}

else if (strcmp(kd,"AL")==0||strcmp(kd,"al")==0)
{
strcpy(nk,"Arga Lama");
if(kls==1)
harga=27000;

else if(kls==2)

harga=19000;
else if(kls==3)
harga=7000;
else if(kls>3)
cout<<"\n\nMAAF KODE YANG ANDA MASUKAN SALAH"<<endl<<endl;
cout<<"\n\n\n\n\n\t\t\t\t\tinput ulang [Y/T]?:";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto logo;
else
goto bawah;
}

else if (strcmp(kd,"PH")==0||strcmp(kd,"ph")==0)
{
strcpy(nk,"naon nya?");
if(kls==1)
harga=210000;

else if(kls==2)

harga=16000;
else if(kls==3)
harga=2000;
else if(kls>3)
cout<<"\n\nMAAF KODE YANG ANDA MASUKAN SALAH"<<endl<<endl;
cout<<"\n\n\n\n\n\t\t\t\t\tinput ulang [Y/T]?:";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto logo;
else
goto bawah;
}
else
{
cout<<"\n\nMAAF KODE YANG ANDA MASUKAN SALAH"<<endl<<endl;
cout<<"\n\n\n\n\n\t\t\t\t\tinput ulang [Y/T]?:";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto logo;
else
goto bawah;
}
cout<<"Nama Pemesan:";
cin>>np;
cout<<"Nama Kereta:"<<nk<<endl;
cout<<"Kelas Kereta:"<<kls<<endl;
cout<<"harga tiket:Rp."<<harga<<endl;
cout<<"jumlah pemesanan tiket: ";
cin>>jml;
bt=10000;
cout<<"Biaya tambahan Fasilitas:"<<bt<<endl;
pb=harga*jml+bt;
cout<<"Pembayaran:"<<pb<<endl;
if (jml>5)
        {

        strcpy(dcs,"25 persen");
        }


else
      {    strcpy(dcs,"Maaf Anda Tidak Dapat discount");
      }
cout<<"discout:"<<dcs<<"\n\n";

cout<<"*******************************************\n\n";
tp=0.25*pb;
cout<<"total pembayaran\t\t:Rp."<<tp<<endl;
cout<<"uang bayar\t\t\t:Rp.";
cin>>ub;
uk=ub-tp;
cout<<"uang kembali\t\t\t:Rp."<<uk<<endl;

cout<<"  \n\n\n\nINGIN INPUT LAGI [Y/T]?:";cin>>lagi;
if(lagi=='Y'||lagi=='y')
goto logo;
else
goto bawah;
bawah:
{
system("cls");
cout<<"\n\n\n\n\n==================================\n ";
cout<<"\t\t\t....TERIMAKASIH! SELAMAT DATANG KEMBALI....\n ";
cout<<"\t\t================================== ";
}
getch();
}